1221002199 has 24 divisors (see below), whose sum is σ = 1774936800. Its totient is φ = 808821312.

The previous prime is 1221002197. The next prime is 1221002201. The reversal of 1221002199 is 9912001221.

It is an interprime number because it is at equal distance from previous prime (1221002197) and next prime (1221002201).

It is not a de Polignac number, because 1221002199 - 2¹ = 1221002197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1579177 + ... + 1579949.

It is an arithmetic number, because the mean of its divisors is an integer number (73955700).

Almost surely, 2^1221002199 is an apocalyptic number.

1221002199 is a deficient number, since it is larger than the sum of its proper divisors (553934601).

1221002199 is a wasteful number, since it uses less digits than its factorization.

1221002199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1668 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1221002199 is about 34942.8418849984. The cubic root of 1221002199 is about 1068.8222400744.

The spelling of 1221002199 in words is "one billion, two hundred twenty-one million, two thousand, one hundred ninety-nine".